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What is the function of the crankshaft?

1 Answers

DelGrace

07/29/25 3:04pm

The function of the crankshaft is to: receive the force transmitted by the connecting rod and convert it into torque, which is then output through the crankshaft to drive other engine accessories. The crankshaft is subjected to the combined effects of centrifugal force from rotating masses, periodically varying gas inertial forces, and reciprocating inertial forces, causing it to bear bending and torsional loads. To reduce the mass of the crankshaft and the centrifugal force generated during operation, the crankshaft journals are often made hollow, with oil holes drilled on the surface of each journal to allow the introduction or removal of oil for lubricating the journal surfaces. To minimize stress concentration, the connections between the main journals, crankpins, and crank arms are all designed with transition arcs.

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